Type-writing machine.



J. A. RONCHETTI.

TYPE WRITING MACHINE. APPucA'H N FILEDJUNE5.1908.

Patented Feb. 8, 1916.

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'- CONNECTICUT, A CORPORATION OF CONNECTICUT.

TYPE-WRITING momma antenna.

To all whom it may concern:

Be it known that I, JOSEPH A. RONQHETTI,

I a subject of the King of Italy, residing' at lVoonsocket, in the county of Providence and State of Rhode Island, have invented certain new .and useful Improvements in Type-lVriting Machines, of which'the following is a full, clear,- and exact description,

such as will enable others skilled in the art to which it appertains to make and use the Same. I i

This invention relates to typewriting machines and more particularly to the key actions thereof.

' One of the objects of-the invention is to provide means of improved construction for have equal clips;

returning the key levers to normal positions after depression;

Another object is to provide afulcrum for the key-levers of typewriting machines such that the key-levers while normally locked against accidental 'dislodgment may be readily removed from the fulcrum when desired.-

Another object is to provide means whereby key-levers of unequal length which are mounted upon the common fulcrum may A further object is to provide improve ments generally in the key-actions of typewriting machines.

Other objects will be in part obviousand' in part pointed out'hereinafter.

' The invention accordingly consists in the features of construction, combinations. of I elements and arrangement of parts which "willbe exemplifiedin the construction here inafter set forth, and the scope of the application of which will be indicated in the following claims. p

In the accompanying drawing wherein is illustrated one of the various possible embodiments of my invention, Figure-1 is a view in plan thereof. Fig. 2 is a view'taken longitudinallythrough a portion of a typewriting machine, the mechanism constituting my invention being shown inelevation. Fig. 3 is a line-3 3 of Fig. 2 looking in the direction of the arrow. Fig. 4 is adetached view of a portion of one key-lever in a different position, mally locked against removal. Fig. 5 is a sectional viewtaken substantially on the Specification. or Letters Retentview. taken substantially on the showing the manner whichit is nor- I11 mam -Est. s, rate.

Application filed Shine 5, 1908. Sem t c. 436.744.

* line 5 5 of Figiaulookinginthe direction of the arrow. Y

Similar reference characters refer to similar parts-throughout-the several views of the drawing.

Referring'nowto drawing, '1 denotes a portion of; the "framing of ,the machine, across the rear lower portion ofwhich is extended a fulcrum-barfz, said bar being suitably supported at'its ends in the'framework of the machine. This bar is provided-with a depending lm'ife -edge portion 3, which forms a common. pivot for-each of the key levers of several banks, individual key levers of each of the banks .being shown at 4, 5 and 6 respectively.- The key levers. of each bank are of a length different from those of' the others thereof as shown in Figs. 1 and 2, and each key lever at its rear end is slightly of- 'set' as at 7, said offset portion-being-provided with a slot 8,-substantially V shaped as shown, which receives the knife edge 3 of the fulcrum bar.

10 represents a slotted comb member,

by means of screws,- one of which is shown at 11 and is also supported at; its ends in the framework of the machine. bars pass through-the slots. 12 of this combmember and the distance between knifeedge position and returned to such position after.

depression by means of a bent spring 15, the

upper end of which is bent downward: as at which is secured to the fulcrum-bar 2 as The type 16 and then extended through an eye 17 formed in the key lever,'the outer end'18 I of said spring being bent 'back inthe direce tion of the curved portion of the springgyandengages the side of the keylever.- ;By means of this construction, theseveral springs are maintained in parallelism with their keylevers, said ,keyleve'rs and said springs lying in adjacency. The opposite end of each. of

springs --15'-is supported-upon an adjusting screw 20, which is threaded in a forward extension 21 of the comb member 10. Through a manipulation of'these adjusting screws, ithesprings may be given any desired degree of tension, as will be obvious.

It will be noted that the springs 15 hold the fulcrum parts of the key levers in engagement with the knife point 3 of the fulcrum bar 2,-and also operate to return the key levers to, and hold them in,- their normal positions after depression.

In order to give the key levers 4, 5 and 6,

which constitute individual members of the shortest length approaches the universal barv as far as .the line 6. Therefore, the key levers 5 and 6, move slightly before they engage the universal bar, the construction being such that the dip of all the key levers in the. several banks will be equal and the stroke of the universal bar will be the same when any of the several levers is depressed.

In order to equalize the feel upon the several key levers, leaf springs 26 and 27 are introduced between the key levers 5 and 6 of the middle and upper banks, which arespaced from. the universal bar, each of the several springs being fastened to its key le-' veras at 28, the end of the spring resting upon the universal bar. During the down ward movement of the key levers'e'quipped with such springs, said springs will-ultimately be collapsed against the surfaces 30 and 31 of the key levers.

As will be observed from the above. description, the several key levers are held against their fulcrum, which is constituted in the present instance by the knife edge 3, by means of the spring 15. Consequently, if any of the key levers should be pushed backward or forward, as shown in Fig. 4:, the walls of the ll-shaped slot 8 will abut the knife edge and the bottom 32 of the key lever will abut the bottom wall 13 of one of the slots 12. lit will therefore be impossible unintentionally to remove the key levers from their fulcrum when they occupy either a normal or a depressed position, or any position between said two positions. When, however, any one of the key levers is swung to the osition illustrated in the dotted lines in ig. i, said key lever may be withdrawn from between the comb l0 and the fulcrum bar 2.

It will accordingly be seen that l have provided a construction well adapted to attain, amongothers, the several ends and objects. above enumerated, in a pie yet eficient manner. While the key levers are norly locked roval, they may be removed with great facility when desired. Another advantage inherent in the construction is the simplicity of the returning spring structure and the manner in which individual springs are always maintained in their proper position adjacent the key levers. *The spacing of the middle and upper, banks of keys from the universal bar also provides for an equal dip for each .key lever when depressed, and the feel of the several keys is equalized by means of the springswhich are introduced between the middle and upper banks of keys.

I In order to' remove any chance of ambiguity occurring-in this specification or in the claims, it, may here be noted that by the term dip is meant. the distance traveled by the key'end of each of the key levers when depressed to efi'ect printing, and by the term feel is meant the character or quality of the resistance ofiered by the key levers to depression.

As many changes could be made in the above construction and many apparently widely difl'erent embodiments of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the above descrip tion or shown in the accompanying d aw: ings shall be interpretedas illustrative and not in a limiting sense.

Having described my invention, what. li

claim as new and desire to secure Toy-Letters Patent, ,1.SZ

Mill

1. In a typewriting machine, the combina- 1 tion with a key lever, of a fulcrum for the same, means for returning the key lever to normal position after depression comprising a curved spring extendedthrough an eye provided in the key lever and having a portion thereof engaging the side of the key lever, whereby said spring ,is maintained in position adjacent the key lever,

and'an adjustable support for said spring suspended from said fulcrum, Q 1

2 In a typewriting machine,-the combinat on with the key-levers having holes therein, of a fulcrum for said key-levers, and means for maintaining the key-levers in engage nent with said fulcrum and for returning them to normal position after depresslon, comprising curved springs, one end of each of which is supper from said fulcrum and the opposite end is through thehole in said key-lever and bent in a direction to lie in a plane parallel with the plane of the by of said spring against the oo-site side of said key-lever, so as to hold ll tive relation.

3. la a typewriting machine, the combination with the key levers and a fulcrum therefor, of a curved spring arranged in parallel relation with each at said hey levers, each passed e key-lever and said spring in opera.

of said key levers being provided with an eye through which one end of the spring extends, an adjusting screw for supporting the other end of said spring and a support suspended from said fulcrum in which the adjusting screw is mounted.

4. In a typewriting machine, the combination with the key-levers, of a fulcrum therefor, curved springs the body portion of each of which lies in a plane in parallel relation with each of said key-levers, each of said key-levers being provided with a hole through which one end of the spring extends, an adjustable screw for supporting the other end. of said spring, and a support suspended from said fulcrum in which the adjusting screw is mounted.

5. In a typewriting machine, the combination with the key levers, of a fulcrum therefor, springs for holding the key levers in engagement with their fulcrum, and means mounted on said fulcrum for holding the key levers against removal when in their normal positions but which permits their removal when they are moved upward from their normal positions.

6. In a typewriting machine, the combination with the key levers,.of a knife-edge fulcrum therefor, springs for holding said levers in engagement with their fulcrum, and means disposed beneath the key levers'and suspended from said fulcrum which cooperates therewith to prevent the removal of the key: levers when they occupy their normal position, but which permits the removal of the key levers when they are swung upward fromtheir normal positions.

7 In a typewriting machine, the combination with the key levers, of a depending knife-edge fulcrum therefor, spring means for maintaining the key levers in engagement with said fulcrum, and a member suspended from said fulcrum disposedbeneath the. key levers adjacent their fulcrum'points and extending in parallel relation with said fulcrum, which coiiperates therewith to prevent a removal of the key levers when they occupy their normal positions, but which permits said key levers to be withdrawn from their fulcrum when they areswung upward from normal position.

8. In a typewriting machine, the combination with the key levers, of a fulcrum bar having a depending knife edge with which said key levers engage and which forms a fulcrum therefor, and a slotted member arranged adjacent said bar through which the ends of said key levers extend, said slotted member and said fulcrum bar cooperating to lock the key levers against removal when the same are in normal or depressed positions, but permitting the key levers to be I withdrawn when they are swung to positions above their normal positions. a

9. In a typewriting machine, the combination with the key levers, the fulcrum end of each of which is provided with a V- mal positions, but permitting the removal thereof when they are swung upward from their normal positions, and a spring engaging each of the key levers and maintaining 1t in engagement with its fulcrum.

10. In a typewriting machine, the combination with the universal bar, of key levers arranged above the same, and springs interposed between the key levers and the universal bar.-

11. In a typewriting machine, the combination with the universal bar, of a plurality of banks of key levers, the key levers of each bank differing in length from those of the other banks, and springs interposed between the key levers of certain of said banks and the universal bar.

12.- In a typewriting machine, thecombination with the universal bar, of a plurality of banks of key levers extending across the universal bar above the same, the key levers constituting one of said banks resting upon the universal bar and the key levers constituting the other of said banks being spaced from said universal bar, and springs interposed between the key levers of said last-mentioned banks and the universal bar.

13. In a typewriting machine, the combination with the universal bar, of a plurality of banks of key levers, each bank being. constituted by key levers of equal length but of a length differing from those of the other banks, the key levers of one of said banks resting upon the universal bar and those of the other orothers --of said banks being raised above said universal bar, anda spring interposed between the key levers of each of said last-mentioned bank or banks and the universal bar.

14. In a typewriting machine,'the combination with the universal bar, of a plurality universal bar,-the key levers constituting each bank differing in length from those of the others of said banks, a common tulcrum for said key levers, the key levers of one of said banks resting upon the universal bar and those of the other banks being out of contact therewith, and a spring attached to each key lever of said last mentioned banks and nterposed between the same and the universal bar.

16. In a typewriting machine the combination with the universal bar, of a plurality of banks of key levers disposed above the universal bar, the key levers constituting each bank being of an equal length but of a length difierent from those of the others of said banks, and spring means for equalizing the dips of each of said key levers.

l7. lln a typewriting machine the combination with the universal bar, of a plurality of banks of key levers disposed above the universal bar, the key levers of one of said banks resting upon the universal bar, and those of the other banks being out of contact therewith, and means for equalizing the feel of said key levers when they are depressed.

l8. ln a typewriting machine, the combination with the universal bar, of a plurality of banks of key levers disposed above the universal. bar, the key levers constituting each bank being equal in length but of a length difiering from those of the others of said hanks, a common fulcrum for said key levers, the key levers of one of said banks resting upon the universal bar and those of the other banks being out of contact therewith and spaced such distance therefrom as will give each of the key levers of the several banks an equal dip, and means for equalia ing the feel of said key levers when they are depressed to edect printing.

l9. lln a typewriting machine, the combination with a universal bar and a plurality of key levers disposed above the so, one of said key levers being in contact with said universal bar and another of said key levers being disposed above and out of contact with said universal bar, and resilient means between said second mentioned key lever and said universal bar whereby the dips of each of said key levers is equalized.

20. lln a typewriting achine, the combination with the key levers, of a fulcrum therefor, springs for holding said key levers upwardly against said fulcrum, and means supporting said springs at one end from beneath the fulcrum, each of said springs he ing curved in the direction of its length and having its opposite end hent backwardly u on itself in a manner to engage both sides ot said key lever to prevent a tilting motion thereof.

2i, In a typewriting machine, the combi= nation with the key levers, of a iulcrum therefor, a comb through. which the ends of said levers pass co-acting with said fulcrum to hold the key levers in place and means preventing a downward movement of said key-levers to remove the same.

22. lln a typewriting-machine, the combination with the key levers, of a fulcrum therefor, an inverted comb member co-acting; with said fulcrum to hold said key levers in place, and the spring means intermediate said comb member and said key levers for returning the latter to normal position.

23. In a typewriting machine, the combination with the key levers, of a fulcrum her having a depending knife edge with which said key levers engage and which'forms a fulcrum therefor, spring means for holding said key levers against said fulcrum, and a slotted member arranged adjacent said bar through which the ends of said levers extend, said slotted'member and said fulcrum bar coiiperating to lock the key levers against removal when the same are in normal or depressed positions, but permitting the key levers to be removed when they are swung-to positions above their normal posi tions.

2%. ln a typewriting machine, the comb nation with the key levers, of a fulcrum having a depending knife edge with which said hey levers engage and which forms fulcrum therefor, a plurality of? curved springs each having one end secured in rela-= tivcly fixed position with said fulcrum and having their opposite ends engaging" respectivel with the key levers, and a slo mom or arran ed adjacent said her through which the ends of said levers extend, said slotted memher and said fulcrum bar cooperating-to lock the key levers against re moval when the some are in normal or pressed positions, hut permitting the key levers to he removed when they are swung to positions ahove their normal ositions.

25 ln s ty ewriting machine, in combination, a plura ity of pivoted key-levers ha ing free extremities movable downward and upward from normal position, a common fulcrum for said levers, and means to main tain said levers and fulcrums in coiiperative relation during pivotal movement of the former downward from normal position and IL to permit removal of said levers from said fulcrum when the former are pivotally moved upward from normal position.

lln testimony whereof ll ailix my signature in the presence of two witnesses.

. I rllldhl lll :ihlllllll' RONt'lllIl'll. Witnesses: 6. H. Wmeon,

Yd. Shamans. 

